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(No Model.) J. P. DANDURAND.

KEY. No. 398,499. Patented Feb. 26, 1889.,

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/% @Jdcozmma- UNITED STATES PATENT OFFICE.

JOSEPH P. DANDURAND, OF VIRGINIA CITY, NEVADA.

KEY.

SPECIFICATION forming part of Letters Patent No. 398,499, dated February26, 1889.

Application filed May 25, 1888. Serial No. 275,127. (No model.)

To 0. whom it may concern:

Be it known that I, J OSEPH P. DANDURAND, of Virginia City, in thecounty of Storey and State of Nevada, have invented certain new anduseful Improvements in Keys; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to an improvement in keys, the object of the samebeing to provide a safety-key by means of which, when the same isinserted and secured in a lock, the forcible insertion of a duplicatekey will be rendered impossible.

A further object is to provide a key of the above character with deviceswhereby, when the same is secured in a lock, the key cannotbe movedtherefrom from the opposite side of a door.

A further object is to provide a key of the above character which shallbe simple and economical in construction and durable and efficient inuse; and with these ends in view 1 my invention consists in certainfeatures of construction and combinations of parts, i

as will be hereinafter "fully described, and pointed out in the claim.

In the accompanying drawings, Figure is a side view of the key. Fig. 2is a front view thereof, and Fig. 3 is a sectional view.

(1. represents the handle of the key, and b the stem. To the forward endof the stem is loosely mounted the tumbler 0,. adjoining 1 which isrigidly secured to the stem the bit (I. To the rear of the said bit issecured another tumbler, e, the same being provided with a longitudinalperforati 011, adapted to receive hole, and thereby prevent theinsertion of a duplicate key. The lock is turned and fastened by meansof the bit d, which rotates with the stem. The tumblers being looselymount ed thereon, of course retain their positions without strain uponthe same. hen the lock is turned as described, the key is prevented frombeing forcibly shoved out of place by means of the pint, which is pushedforward to engage the side of the bit, thereby preventing the bit (Zfrom being in line, either naturally or by manipulation, with thetumblers c and a, without which the key cannot be moved from the lock.

It will be seen that a key of the above description, may be used 011 anylock and from each side of a door.

Having fully described my in ven tion what I claim as new, and desire tosecure by Letters Patent, is

A key having the bit rigidly secured to the stem thereof, tumblersmounted on either side of the bit, and a pin passing through one of saidtumblers and engaging the side of the bit, substantially as shown anddescribed.

In testimony whereof I have signed this specification in the presence oftwo subset-i1, ing witnesses JOSEPH P. DANDURANI).

Witnesses:

S. R. IIIGLEY, GEO. J. \X "RIGHT.

